I did consult with Dr Izukawa and Chen, DR I being the first neuro surgeon I consulted with. This can be a long dragged out process. See my PM response to yours. I would agree with the others on the forum who have suggested that your Mom's high blood pressure be treated first. Most AN are not life threatening at this size. When they get about another cm larger, then you're in big trouble zone.
There are many discrepancies in the measurement of size, as the doctors don't all measure the same slide, and the MRI takes so many slices. If Mom's high blood pressure is not directly correlated to the AN then I believe you have time. You are allowed to consult with many surgeons, and I urge you to do just that. AND I urge you to ask Dr's C and I all the same questions.
ie What are the odds of facial paralysis, what technique will you be using, how many of these surgeries have you done this year, this decade...how often do you operate with DR. C or I, who does what? It's such a hard journey, I couldn't imagine just starting out at 65. I have missed the Local AN support group meeting again ( I suck) but they have meetings by monthly at 271 Spadina St in Toronto. It might be good for you and Mom to go.
Check out the ANAC site. There is information for you there.